Human Factors Evaluation of Vocoders for Air Traffic Control ... - FAA

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Table 20. Analysis of Simple Main Effects for Speaker Intelligibility Ratings Equipment Background F Statistic Result Vocoder A Jet 0.88 Not Significant Vocoder A Propeller 0.44 Not Significant Vocoder A Helicopter 6.38 Significant* Vocoder A None 35.50 Significant* Vocoder B Jet 14.27 Significant* Vocoder B Propeller 1.12 Not Significant Vocoder B Helicopter 10.46 Significant* Vocoder B None 11.12 Significant* Radio Jet 1.24 Not Significant Radio Propeller 0.98 Not Significant Radio Helicopter 5.79 Significant* Radio None 0.39 Not Significant * p < .05 Table 21. Tukey HSD Post Hoc Comparisons for Speaker Intelligibility Ratings Equipment Background Interpretation Vocoder A Jet Not Significant Vocoder A Propeller Not Significant Vocoder A Helicopter Male voice mean intelligibility rating is higher than female voice mean intelligibility rating Vocoder A None Female voice mean intelligibility rating is higher than male voice mean intelligibility rating Vocoder B Jet Male voice mean intelligibility rating is higher than female voice mean intelligibility rating Vocoder B Propeller Not Significant Vocoder B Helicopter Male voice mean intelligibility rating is higher than female voice mean intelligibility rating Vocoder B None Female voice mean intelligibility rating is higher than male voice mean intelligibility rating Radio Jet Not Significant Radio Propeller Not Significant Radio Helicopter Male voice mean intelligibility rating is higher than female voice mean intelligibility rating Radio None Not Significant 27
Mean Intelligibility Rating Vocoder A Equipment Condition 8 7 6 5 4 3 2 1 JET PROP HELO NONE Background Noise Condition MA LE FEMA LE Figure 11. Mean intelligibility ratings as a function of sex of speaker and background noise for vocoder A messages. Vocoder B Equipment Condition Mean Intelligibility Rating 8 7 6 5 4 3 2 1 JET PROP HELO NONE Background Noise Condition MA LE FEMA LE Figure 12. Mean intelligibility ratings as a function of sex of speaker and background noise for vocoder B messages. 28
Page 1 and 2: ote technical note techn Human Fact
Page 3 and 4: 1. Report No. DOT/FAA/CT-TN97/11 Te
Page 5 and 6: Table of Contents Acknowledgement .
Page 7 and 8: Figures 11. Mean Intelligibility Ra
Page 9 and 10: Executive Summary This study evalua
Page 11 and 12: Pickens (1996) reviewed the four fu
Page 13 and 14: 2. Method 2.1 Experimental Design 2
Page 15 and 16: Table 1. Description of Aircraft Ba
Page 17 and 18: To prevent the participants from be
Page 19 and 20: stimulus materials aided by the ATC
Page 21 and 22: noise. This direct communication li
Page 23 and 24: participant. A custom-made switch p
Page 25 and 26: Table 6. Mean Intelligibility Ratin
Page 27 and 28: Table 12. Analysis of Simple Main E
Page 29 and 30: Mean Intelligibility Rating Female
Page 31 and 32: Mean Acceptability Rating Female Vo
Page 33 and 34: Mean Intelligibility Rating 8 7 6 5
Page 35: Male Voice Condition Mean Acceptabi
Page 39 and 40: Table 23. Tukey HSD Post Hoc Compar
Page 41 and 42: Mean Acceptability Rating Radio Equ
Page 43 and 44: Table 27. ANOVA for Message Complet
Page 45 and 46: 3.3.1 Proportional Responses Of the
Page 47 and 48: Table 31 gives the classification u
Page 49 and 50: Table 32. Exit Survey Results Query
Page 51 and 52: 4.1.4 Correlation Results The resul
Page 53 and 54: References Child, J., Cleve, R., &
Page 55 and 56: Acronyms ANOVA APT ARTCC ATC ATCS A
Page 57 and 58: BEGIN Phrase A1: “JETLINK TWENTY-
Page 59 and 60: A.3 Audio Preference Test INSTRUCTI

Human Factors Evaluation of Vocoders for Air Traffic Control ... - FAA

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